If there is no obvious effect of anal stenosis through digital dilation, surgical treatment should be adopted. The surgical methods are divided into the following methods depending on the degree, location and scope of the stenosis: 1. Tubular skin grafting: suitable for annular stenosis, which is equivalent to making a brand new anal canal. Defecation needs to be controlled after the operation, and regular intervals are required after the wound heals. Expand the anus to prevent contracture of the skin graft and cause new stenosis. 2. C-shaped skin graft anoroplasty. 3. Anal canal V-Y plasty: Make an incision on the front and rear midlines of the anal canal, and make two more incisions on the outer ends of the incisions to make them into a "Y" shape. Then free the skin graft and pull it into the upper end of the anal canal incision. Suture, suture the wound to make it a "V" shaped wound, thereby enlarging the anal canal. 4. S-shaped skin graft anoroplasty: suitable for a wide range of circumferential stenosis of the anal canal. 5. Anal canaloplasty: It is suitable for all kinds of anal stenosis. Before the operation, the sphincter should be ensured to be intact. Just behind the anus, cut the skin and subcutaneous tissue, separate it downward 2cm, and then sew the lower edge of the mucosa to the subcutaneous tissue outside the anal edge, but do not sew with the sphincter to avoid eversion of the mucosa and unclean anus. 6. Linear incision method behind the anal canal: suitable for moderate and mild stenosis. After local anesthesia, incise the stenotic scar in the posterior midline, cut through the anal comb induration, relax the anal canal, and extend the incision outward. for outflow. At the same time, the anus should be expanded regularly after surgery to prevent recurrence of stenosis.